As the monarch, you'll draw an extra card during your end step , and when another player is the monarch and Queen Marchesa is in play, you'll create a 1/1 black Assassin token with haste and deathtouch
It plays nicely with effects that care about cards that leave your graveyard like Teval, the Balanced Scale and Insidious Roots
(It's an artifact with " , Sacrifice this token: Add one mana of any color.") Enchantment Color tag templates(None) Tainted Remedy If an opponent would gain life, that player loses that much life instead
What was the price range (spread)
I'd pull in cards from the precon and think about restricting myself to LoTR cards, or at least avoid using Magic lore legendaries
Jace is a viable sideboard card for a lot of blue midrange and tempo shells while being a main staple in control decks